Casio CTK-480 User Manual download pdf (Page 5)

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AVDD

AG AG AG AG

16 V 10 µ

2SC1740SQ

10 K

10 K 10 K

C332(H)

33 K

C152 (H)

C221B (A)

10 V 22 µ

2.2 K

To main volume

From the CPU

CPU (LSI101: MSM6755B-06)

The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides left and right

channel sound waveforms in accordance with the pressed key and the selected tone.

The following table shows the pin functions of LSI101.

Pin No. Terminal In/Out Function

1 ~ 29 MA14 ~ NC2 — Not used.

30 DGND In Ground (0V) source

31 DVCC In +5V source

32, 33 XTLO, XTLI In/Out 20MHz clock input/output

34 NC3 — Not used. Connected to ground.

35 RSTB In Reset signal input

36 P24/RXD — Not used. Connected to +5V.

37 P25/TXD — Not used.

38 NMI In Power on signal input

39 APO Out APO (Auto Power Off) signal output

40 NC4 — Not used.

41 REFH Out Terminal for the internal DAC

42, 43 NC5, NC6 — Not used.

44 DAOR Out Right channel sound waveform output

45 NC7 — Not used.

46 AVdac In +5V source for the internal DAC and ADC

47 DAOL Out Left channel sound waveform output

48 REFL Out Terminal for the internal DAC and ADC

49 AGdac In Ground source for the internal DAC

50 AGadc In Ground source for the internal ADC

51 ANI — Not used. Connected to ground.

52 AVadc In +5V source for the internal ADC

53 NC8 — Not used. Connected to +5V.

54 MOD0 In Mode selection terminal

55, 56 MOD1, MOD2 In Mode selection terminal

57 KO9/P40 In Power source detection signal input

58 ~ 65 KI0/P30 ~ KI7/P37 In Terminals for key/button input signal

66 ~ 73 KO1/P50 ~ KO8/P57 Out Terminals for key scan signal

74 ~ 77 P20 ~ P23 Out Terminals for button input signal

78 NC9 — Not used.

79 LVCC In +5V source

80 ~ 82 CC1 ~ CC3 Out LED common signal output

83 ~ 87 — — Not used.

88 ~ 95 La ~ Lg, Lp Out Not used.

96 LGND In Ground (0V) source

97 ~ 100 — — Not used.

FILTER BLOCK

Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.

1 2 3 4 5 6 7 8 9 10 ... 15 16

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Casio CTK-480 User Manual Page 5

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